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ffii/717m?) N.PETEHS. FHOTC-LITHOGRAPHER WASHINGTON D C UNITED STATESPATENT OFFICE.

CHARLES CHINNOOK, OF NEW YORK, N. Y.

RULE AND SOCKET JOINT.

Specication of Letters Patent No.

To all whom t may concern Be it. known that I, CHARLES CHINNooK, of thecity, county and State of New York, have invented a new and usefulImprovement in the Rule and Socket Joints; and I hereby declare that thefollowing is a full and exact description.

To enable others to make and use my invent-ion I proceed to describe itsconstruction and operation reference being had to the drawings hereuntoannexed and making part of this specification.

Figure l represents a cheval glass to which the rule joint is applied.Fig. 2 the same, side elevation. Figs. 3 and 4 the parts of the stand 3being made to fit in a socket in the upper part of t. 5 shows part ofthe rule joint. The stem has upon it as seen in 6 and 7 the springswhich hold it firm against the other part of the joint. Fig. 6 View ofthe rule joint, spiral spring and thumb screw complete. Fig 7 sideelevation of the same with a spring of india rubber applied instead of aspiral spring. Fig. 8 plan of that part of the rule joint seen in Fig.5. Fig. 9 the india rubber spring which is only a piece the kind ofindia rubber tubes used for conveying water. Fig. 10 plan of the platewhich is attached to the stand as seen in Fig. 2. The stem, seen in 6and 7 runs through the stand. rThe spring is imbedded into it and thethumb screw is flush with the outside. Fig. 11 shows the ball and socketoint, adapted for an easel or changeable stand. F ig. 12 thelongitudinal section. The ball E, Fig. 11 has a slot; in it into whichis hinged a rod, D. The ball is held firm upon the top of the tube B, bythe rod, D, which passes through a diaphragm, H, which is permanent andhas upon it a spiral spring, as, G, or an 7,080, dated February`12,1850.

india rubber spring as, F, and is governed by a nut at the bottom. Fig.13 the universal ball and socket joint, Fig. 14;, section,

Fig. 15, section of Fig. 12. Fig. 16 the rule joint for tables-17-thesame entire with catch-18-19-the same 20 section.

The universal ball and socket joint is thus made z-The top part is intwo pieces. N is unscrewed and taken from YL The ball is then passed upthrough the cylindrical piece, L, and the top piece N is screwed on.spring .of india rubber, I, is put in beneath and touching the ball andthe lower part is then screwed on and this forces the spring up firmagainst the ball and holds it as firm as required. A

The principle of all these joints is that a spring is used to hold theball firm upon the socket or hold the rule joint together and both ofthese can be governed by a thumb screw, so that any degree of firmnessor looseness can be given.

To fix the ball joint firm when required a "collar, A Fig. 11 is used.This is made to lit on the upright, B, and has a slot cut spirally inone side, into which fits a pin set in B. The turning the collar pressesthe slot on the pin and holds the ball firm.

lVhat I claim as my invention and desire to secure by Letters Patent is-The application to the rule joint and to the ball and socket joint ofthe rod D which is hinged into the ball or rule joint, to hold the jointas lirm as desired by means of the spiral spring, Gr, or the indiarubber spring, P, as described.

CHARLES OHINNOOK.

Vitnesses:

OWEN G. WARREN, NIEL GRAY.

